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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981b4a5bf232dc9a806520cf53c44bb16afaa9b4f8ab850f0c211eafed6ef392' 
  AND token = 'GoPQbZapVCdpcUDF0itQ+uw4hDoINZ++D2fkCfNnlUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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