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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9892e8b5a35596149a0cacfe266f2e794d11864f98726956b703ba2e7102faf' 
  AND token = 'GrC5lcZMIi/olKbggslg2za2U8Cc+j0OZlXnuQTDNaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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