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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676f7812820165b01ad9d4e5ac3d8b29e93c3449b0561dd95f7682f7a2d19aeb' 
  AND token = 'w+SdKLboj0351oa2fMSIR92WQDEzComN6K3DD2VJJ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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