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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bb01a21ec70d37fbb102036544efc3a47529649c89cf1b7ecf3f465ac5fe8b' 
  AND token = 'm2ES8WTbkx2mqB9gsqflOjust9DwIIH2KojVQrYNAPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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