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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169482f8bd7869d2031d94c1f16f5c9c6dec11a8f137aec1414bdc93836ea7e8' 
  AND token = '0tXnQgzs4qF5argBt8AuI2pK+8YIfBm6YhxMmEjfIeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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