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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce70ab4cdc78ee65a7f4ad2c96db6a2b1ac6128aec99b2e7104802f4af92013' 
  AND token = 'Yij6sTscx0lygTkeX3DFoA5Ii4B/ykd6zZNDDY13uaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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