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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdd341921646f8b7bfdeaad73d6720cf46e2942073ce485b1cf738c92f6f2d4' 
  AND token = 'Gai40VmwLxjKQpE+HAWnhxcEIGasMcffyEKE26kY2k8=' 
  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"
    }
  }
}