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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2b5e3a094d5130a879ce6a7595c9a88cb417b3644788f8007ff9f3ee7f2171' 
  AND token = 'DRXbdJ6BiZP32Baq+qUm0SPebh7o2F1Je/Ej+DDjlyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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