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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0088c9323a52486f664159a358c91e130367a49fbedf58030c986b7a1d8a8b' 
  AND token = 'BgCRCqavNdMVpMhs13UIfQIbLko5dEhsbAQ4Of2GD2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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