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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ab741f892cd079b20e4943a12ec842c8eeb36ddc912401c4b3945a0e661e39' 
  AND token = '2MIAMz9Ra4b5/XhaHOLexS5tyMPG8nZGGeT0JjcLG/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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