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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4137d7257daacc3fd5a81d7ad2e92ad45a7718ce35a950ef9e27779c8cfc4921' 
  AND token = 'm7t351r4PSZUOX/6wdjt2ui+Yf8UG0XJmnyAB6WSAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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