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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62ab710a6328834e4a6e25b07ec209c3d48f9bb4eaef5f982d7d24b0275f549' 
  AND token = 'dwVjDY7PWVI5qel8RAJ3j/LiiEr/Lku3+kQRRpeVNas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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