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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc6481ff1a0ef47acd099e01098a1be3c3772ce6f3fad0f7fc760c26f1aac6a' 
  AND token = 'eW6bvlPUhKpaqervlnJ/yreiUB3UgL3f70JY3fz4B1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}