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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2a4d892389a96c9c1770c8c57e33df8ff45b0b934c082afdd6737233e014d0' 
  AND token = 'JoSWyNoXBWxXnh4+wBGF2dMv7PvC3Bh70oPw2X4P/Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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