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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6007d9e11f4125c984b7b632a6e8670c3421bf6f10e001d0c509aa9e167cbcf3' 
  AND token = 'nDZ1sn9Etq672KfloTVoQzhiPu4Hx8L4u1Wto5ZM2iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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