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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a038bf910bd630fe9b7d618bd63f636d2326bf0a8aedeb4a9db31dc0beb5d1' 
  AND token = 'gxj+6bSW3o6UVp3cfP5urmfol/hWzskdJQ+hHxu+ZO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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