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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8849dac07e49167fe67a41dd40d4bbbe3dcacfc7c9cf59a9883c68e2ff3683' 
  AND token = 'MBuR0Y1C2Cgkghgh66PrzkdrQv6cpaqg9/+eXHqkhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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