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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7db6fdf71bebc5eeb7595a14c7dd75fe408d19472eb285df8c06e6971e48f7b' 
  AND token = '+Vuhi2Fbj5SFnB3ICi1lvi8+itd0sP/tbG9/hh2oUzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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