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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f13523fa4ca7fc26bd40f7f71cf75a6709c05c9d13120debad8797974c8d74b' 
  AND token = 'qzxctxcOzleQdW4d4UM71a9FrB39Fn7cO96zsW+0CJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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