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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c541c8dce26231607b99c46133134eda3980f5354842850e4a257aecc0f2df' 
  AND token = 'T2BN1xzp9bd11Vwry9mB8JjbM0K8oHbU3oeDtmlJv4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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