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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbad02310f81c58ec176c206bbc4624ffb5650ded700579a2f83969e9a4d05b7' 
  AND token = 'j3nnaqXO0E87PdRv9ztQ1S0q0YEDy1Y0Kx4e93w0/bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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