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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876bfaf8d7af92c78583e54fe601b4c8b92f4b8dda2e2a94939beee01a39986f' 
  AND token = 'zGU3FJcKMefL3qzEC6nfAIZQ0qn9dGsflQlzC2XzpVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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