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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e43fc79bdde759da602a7f01a8a8a83d25866e0fdc5fc10de8fd5e1c76fbac7' 
  AND token = 'SaZv2iKE/eQSFXneljsk3EGYfi7l+Wbmf04mN76T+AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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