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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4a7cc5d67cd9fb15cba9c1db1d3fd7d3a1a9526c57a9574ef5aa634b5f923d' 
  AND token = 'e3cG5dgUHG8VxHJZzK1kjpQNqnc+IMErMeIYMQ2CM5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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