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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d71f79280f3e338becbf0e650b059c77e7d31417382a573baf2fa675c4e8444' 
  AND token = '0O3hoGI1sQm3gQtci301DtwHCuHLIGoizXmLlCVK7FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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