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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06a8bfd662b058e2a5ee3489dadb9a5825050698e64c22f113cfacd47c1184e' 
  AND token = 'tY8/gdymLP/7e+SzQg/U+YxMMWLnOtxTypCBX7ZtHx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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