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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044f670392a3fcb5ef33897e2a33a12070b6c63267aee1775497f831ba955f5b' 
  AND token = 'xrzO2ozvtNStdKAwICN0uAjNql1sHtgKB0CP2yR4EKg=' 
  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"
    }
  }
}