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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682508795dd3546be01d984e4e21852ee610c82a949937280a4edb1cbfb3aa99' 
  AND token = 'DEhjqAhBsP4jJtcep2SKY5toc7D52+8ucD32c5gv1Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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