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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b40d6c295ae20981767ce90cc6709c87c808a257bf4d9ff955f9ce30c2978c' 
  AND token = 'Y5brP9TZgiZtY5Pt9SK3w2356jSnfFhQu08UZdo5rK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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