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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5807d9d19aef59641ff08cf26dce81b0f0f7cee2fd64e3c3e7ba65a3ae35f5a8' 
  AND token = 'zT2XSk0lprvQidvIXFF9eqMvlBP1DBksWdezcLeCJcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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