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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040f5e85d855cda29ae2408b4b8b59b5bc0be0a94175bd2ba82e4e84d256da60' 
  AND token = '33TopHWOSZXC/Rlpv8OmcVSlIP+2a0rSZeE7NQFnM+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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