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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5764b1c8894e6057e8d63dd06cafd17c0dd3564259ea00729d6be9c5be9be23a' 
  AND token = 'VdmEPHU2f8gWUDrM0ht+4u9lCqCxj7XVp8QN2FtRtcU=' 
  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"
    }
  }
}