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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b407038eeb950de3a41e0db2bd3cc314643b9b14b63c92bd980c35743873be11' 
  AND token = 'XAIOLhHqltOkk5ZTtS8bvoP4oyAU6HQx3ye5I5vc2EY=' 
  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"
    }
  }
}