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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3097346e8ce8c0b838c19396f2ff3db468430ec16b728e671eac8e86de3b98' 
  AND token = 'OaiKmp/n+dd9TeeOnG+QA5rYEtAkpYLC3xtFyMmv6ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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