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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf65c979246b14898cb0ab6fa1f95c52abb1a9c0008a56a74796ba557dbc5e2e' 
  AND token = 'YKqRpYoL2oXWY3xO2TnlORRSmj6SO4Wsp1bS2ugpKF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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