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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c2e15ecd08eccd8ad94cade4e6f7c23ad8d849d9cff190596a85469bbb63f2' 
  AND token = 'oQluhGaYQ4CwNZu9w+cs/paM2C7/FCL6RlO9duuAHN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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