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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e68c8989be93e59fe875b3ce51d0cf7dff0999d88e2f53e60f7b7d654182512' 
  AND token = 'eQteG7X6iMtzOtA8rTXsCcbsocyvD1Fs0Pk7c3d+KfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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