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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c96178b4e3ea9f7faf6d20509b2211d1a1325d28c3ff4761ae1c73ee7f0ec3' 
  AND token = 'lQejlXARlXrqb532A+xkZK5svTe+l8LBIrCyD8n4i58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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