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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae614e3e9ef6f085045ec43d307a41c9083eac499550d0779663b31aed952b2' 
  AND token = '70Gnxvsqby4ZXaF252EysVFcogqA8egKrWTwmlFsmVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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