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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dff83dc7cbac97024e9b54af7f65c956aea5b019919a19fe2a64dffb7d7001' 
  AND token = '/oKzahFHI7FVKQ+2xNSW09dJapSYBE7yc6WbNDudX7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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