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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2d47504fbe073fb9b784b317a1d4a7e2b3c5bd9a05c1c496345a59e0ad5f0a' 
  AND token = 'Z6D7A+Dy2xG5bc0oR7UKzaxyRliaufxC48CAzP4Casg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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