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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e641592a1c10226394ba6062b8f0fef0ceb5203ad5d8660113c2c7599903cae' 
  AND token = 'U61NTWIYACn8r89tOu31U6bCWPFOJWovuvZg5lq1x4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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