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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8f4b63389b1fd6bb0c03afee233330870c9891daa0b7c6409e854da5996b52' 
  AND token = 'O5iV6JkayxwJBRWmPqtcHRwqWoGguBPaa0vqI5D8HhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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