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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa1c2087059470ce2fc8d8fd3df2b275105a3e1b904a7b5503ba9bf6c7bc6fd' 
  AND token = 'GJOndkAAMB+QXCHRGOAZubLdumEdLS+hdDHYwydsjo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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