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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a35019d19fe2af70215d1c82dac48ea0b53006a6b45d9e5b36fee2859f0a9fb' 
  AND token = '05XMSEAom4o/b6jn8xLjRDAmM1+qKnOJWaF/dkU7Qs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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