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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c29d907fcb80e15e9f19a4c81bbc00b6feaba2d7113ca80e6065a2f3bba40e' 
  AND token = '/LtLT9418ffJizjVNAATqnN8YT6sCwKhlc0R07b+UFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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