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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9badc910bed6c1002fac5c84676d8c14a9373850674b32e898b59e6fab443d11' 
  AND token = 'HC5gOp0h10R+RVPk45GS2pSeui1zxtVIdzktybsbFd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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