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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9c52b97f905d191dc8616d57cdaf7246ee96db67b4a5af47cc8cdec23e419f' 
  AND token = '2SDh8nGssHP+Q7zCu+jrcs4laL8qaoovSpG4GEf/Hfg=' 
  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"
    }
  }
}