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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec2d0e65ff3e3e14a6ab4704e29efb8ed0b9683ca7e4eaa8f3a8893d66ca8b6' 
  AND token = '7kzljiUvtfGhlPr+HzRzZfLNps3bj3qL420n0dlvi/c=' 
  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"
    }
  }
}