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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361115300d5a39c1cb8b9cadc5fc844da66ebae0602fb741c9b6819ff1dc77d' 
  AND token = 'UoH/YrWtzpVxQrU843uGdPej8tDXPKEDuAJTdKNEP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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