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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248a356e1992840e87a31cb80a49a53ea8d7b9fdd2cbf20e9c4b82c5d6758e97' 
  AND token = 'ggNL2h80pHgZFWv+NeqBEuWG4o1ASE891v4NhpmorTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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