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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2f5bf58b368fe0a82f0b38bcd3d3dea45b2731feb5cf2facdf25406cbf8c96' 
  AND token = 'BKmpjedyk6YAjG6YxAmP83rnE/BUFDp7NNByyqYyDWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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