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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31e9d3f2d79ba7e3bcba85cfc1f50e711f3579bb1a8538909d9b4fb332a691e' 
  AND token = 'zwIOVGrOORTWSanE/i8ycpQE67K/URIC9ZoFq7f2Fk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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