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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b24386e3c2c8088c1fd6e8146ecb2fe44cc7e1777bd7dc0c535468d01c72224' 
  AND token = '0VlRFE7g5MSv7LPMdeg2rAUbvrMm+sMvzUCgJ4VLugk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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