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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d6e14840cdd51fd33761006d85a6445d5133b5d6c2dd5358be306da7b7e6ae' 
  AND token = 'voDl+RbUkUyaF8rwvVpe7zONcEimdqRZ1oSmdc1Z1aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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