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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f075394c4bceb12c010e9dcd44384ae631f4af547db5f906bc2f4a572d65d1e' 
  AND token = 'E7353eIAEgLNFctHfTApJx+zYLE08zA0Qd3FW9Qw5ec=' 
  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"
    }
  }
}